|Publication number||US5644208 A|
|Application number||US 08/695,025|
|Publication date||Jul 1, 1997|
|Filing date||Aug 9, 1996|
|Priority date||Aug 11, 1995|
|Also published as||CA2183094A1, EP0758812A1|
|Publication number||08695025, 695025, US 5644208 A, US 5644208A, US-A-5644208, US5644208 A, US5644208A|
|Original Assignee||Alcatel Mobile Phones|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Non-Patent Citations (4), Referenced by (11), Classifications (9), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention concerns a battery and in particular a battery comprising a plurality of cells, in particular lithium-ion cells, connected in series.
The present invention is more specifically concerned with the charging of a battery of this kind.
2. Description of the Prior Art
If a battery of this kind is charged using a single charging circuit connected to the external connection contacts of the battery, in the usual way, and if said cells are not perfectly identical, as is usually the case, one cell may charge faster than the others and therefore be damaged if charging is continued, even though the other cells have not reached their maximum charge. This is the case with the lithium-ion technology, for example.
To prevent this an electronic monitoring system is generally employed so that as soon as the voltage across one cell begins to rise relative to the voltage across the other cells the current charging that cell is limited in order to avoid damaging the cell.
A particular drawback of a solution of this kind is that it is relatively complex and costly.
A particular aim of the present invention is to avoid this drawback.
Accordingly, the present invention consists in a battery comprising a plurality of cells, in particular lithium-ion cells, connected in series and having two external connection contacts constituting charging/discharging contacts and, between said cells, in the electrical circuit connecting them, a switch adapted to be open when the battery is being charged and closed when the battery is being discharged, and, on either side of each of said switches, an external charging contact for connection to a separate charging circuit for each of said cells, each of said charging/discharging contacts also constituting a charging contact for the cell that is directly connected to it.
Other objects and features of the present invention will emerge from a reading of the following description of one embodiment given with reference to the appended drawings.
FIG. 1 is a diagram showing a battery of the invention being charged.
FIG. 2 is a diagram showing a battery of the invention being discharged.
The battery shown in FIGS. 1 and 2 comprises two lithium-ion cells 1 and 2 connected in series.
The battery has two external connection contacts 3 and 4 referred to herein as charging/discharging contacts.
In accordance with the invention, the battery further comprises, between the cells 1 and 2 and in the electrical circuit connecting them, a switch 5 adapted to be open (as shown in FIG. 1) while the battery is charging and closed (as shown in FIG. 2) while the battery is discharging.
In accordance with the invention, the battery further comprises a respective charging contact 6 and 7 enabling each cell to be connected to a respective charging circuit 8 and 9.
Each of said charging/discharging contacts 3 and 4 is used as a discharging contact to connect the battery to a device 10 powered by the battery and also as a charging contact for the respective cell 1 and 2 connected directly to it.
Thus the charging circuit 8 is connected between the charging contacts 3 and 7 and the charging circuit 9 is connected between the charging contacts 4 and 6.
With an arrangement of this kind, each cell being charged separately, the problem of damage to the cells mentioned above is eliminated by virtue of a solution that is relatively simple to implement and low in cost.
|Cited Patent||Filing date||Publication date||Applicant||Title|
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|US4139812 *||Jul 19, 1977||Feb 13, 1979||The Post Office||Battery charging apparatus|
|US5369351 *||Feb 18, 1992||Nov 29, 1994||Angeion Corporation||High voltage charge storage array for an impantable defibrillator|
|US5530337 *||May 22, 1995||Jun 25, 1996||Nec Corporation||Battery cluster charger having a backup charging system|
|EP0017892A1 *||Apr 8, 1980||Oct 29, 1980||Société Anonyme dite SAFT||Automatic switching device for parallel charging and series discharging of two batteries|
|EP0512340A1 *||Apr 24, 1992||Nov 11, 1992||Sony Corporation||Overcharge preventing device and overdischarge preventing device for a secondary battery|
|GB2089592A *||Title not available|
|GB2282924A *||Title not available|
|1||*||Patent Abstracts Of Japan, vol. 14, Nol. 259 (E 0937) dated Mar. 20, 1990 corresponding to JP A 02 079730 (Matsushita) dated Mar. 20, 1990.|
|2||Patent Abstracts Of Japan, vol. 14, Nol. 259 (E-0937) dated Mar. 20, 1990 corresponding to JP-A-02 079730 (Matsushita) dated Mar. 20, 1990.|
|3||*||Patent Abstracts Of Japan, vol. 95, No. 003 corresponding to JP A 07 059266 (Toshiba Corp.) dated Mar. 3, 1995.|
|4||Patent Abstracts Of Japan, vol. 95, No. 003 corresponding to JP-A-07 059266 (Toshiba Corp.) dated Mar. 3, 1995.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5854549 *||Sep 24, 1996||Dec 29, 1998||Motorola, Inc.||Contact arrangement having an auxiliary contact|
|US6172479||Mar 4, 1999||Jan 9, 2001||Baxter International Inc.||Battery control circuit|
|US6239579 *||Jul 3, 1997||May 29, 2001||Estco Battery Management Inc.||Device for managing battery packs by selectively monitoring and assessing the operative capacity of the battery modules in the pack|
|US6326767||Oct 13, 1999||Dec 4, 2001||Shoot The Moon Products Ii, Llc||Rechargeable battery pack charging system with redundant safety systems|
|US6339313 *||Nov 7, 2000||Jan 15, 2002||Estco Battery Management Inc.||Fuel cell manager|
|US6489751||Aug 7, 2001||Dec 3, 2002||Shoot The Moon Products Ii, Llc||Methods and apparatuses for rechargeable battery pack chargers|
|US6541941 *||Dec 5, 2001||Apr 1, 2003||Estco Battery Management, Inc.||Fuel cell manager|
|US8054043 *||Apr 21, 2009||Nov 8, 2011||Sanyo Electric Co., Ltd.||Car power source apparatus including removable cut-off mechanism to stop equalizing batteries|
|US20050275372 *||Jun 14, 2005||Dec 15, 2005||Crowell Jonathan C||Power controller for managing arrays of smart battery packs|
|US20090267566 *||Apr 21, 2009||Oct 29, 2009||Sanyo Electric Co., Ltd.||Car power source apparatus|
|CN101764424B *||Jan 16, 2010||Dec 9, 2015||姚其良||股份组合式快速充电器|
|U.S. Classification||320/118, 320/121, 320/119|
|International Classification||H02J7/00, H02J7/02, H01M10/46, H01M2/10|
|Oct 8, 1996||AS||Assignment|
Owner name: ALCATEL MOBILE PHONES, FRANCE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ABIVEN, BENOIT;REEL/FRAME:008207/0109
Effective date: 19960806
|Jan 23, 2001||REMI||Maintenance fee reminder mailed|
|Jul 1, 2001||LAPS||Lapse for failure to pay maintenance fees|
|Sep 4, 2001||FP||Expired due to failure to pay maintenance fee|
Effective date: 20010701